<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>1_字符串形式的ref</title>
    </head>
    <body>
        <!-- 准备好一个“容器” -->
        <div id="test"></div>

        <!-- 引入react核心库 -->
        <script type="text/javascript" src="../js/react.development.js"></script>
        <!-- 引入react-dom，用于支持react操作DOM -->
        <script type="text/javascript" src="../js/react-dom.development.js"></script>
        <!-- 引入babel，用于将jsx转为js -->
        <script type="text/javascript" src="../js/babel.min.js"></script>

        <script type="text/babel">
            //创建组件
            class Demo extends React.Component {
                //展示左侧输入框的数据
                showData = () => {
                    //refs 获取的是节点
                    console.log(this.refs);
                    //解构赋值
                    const {input1} = this.refs
                    alert(input1.value)
                    alert(input1.type)
                    alert(input1.placeholder)
                }
                //展示右侧输入框的数据
                showData2 = () => {
                    const {input2} = this.refs
                    alert(input2.value)
                }

                showData23() {
                    //因为不是箭头函数 点击事件回调 this 为 undefined
                    console.log(this)
                    console.log(999)
                }

                render() {
                    console.log(this)
                    return (
                        <div>
                            <label>
                                <input ref="input1" type="text" placeholder="点击按钮提示数据"/>
                            </label>
                            &nbsp;
                            <button onClick={this.showData}>点我提示左侧的数据</button>
                            &nbsp;
                            <button onClick={this.showData23}>点我提示左999</button>
                            &nbsp;
                            <label>
                                <input ref="input2" onBlur={this.showData2} type="text" placeholder="失去焦点提示数据"/>
                            </label>
                        </div>
                    )
                }
            }

            //渲染组件到页面
            //  a="1" b="2" props
            ReactDOM.render(<Demo a="1" b="2"/>, document.getElementById('test'))
        </script>
    </body>
</html>